Night shift summary
Andreas, Giuseppe

• we finished to measure sample 17 and 41 in CARD 06_Y2018F04
• we transferred sample Card_07_Y2018F19
• we started measuring sample 500 nm Ti #26

Problems:

• the frame could not be grabbed properly from the transfer arm, so we decide to vent and transfer manually
• we realized that FEL beam drifted horizontally, we corrected by moving M2 pitch. (The beam did not move at XGM in XTD10, so it must have been some mirror movement)

shift summary
Andreas, Giuseppe

• continued pumpprobe measurements
• around 5:30 we could not see any image at the MTE3 camera (after sample transfer), we tried to fix it but did not work
• we tried to remove the samples from the LLC, the LLC is vented but the lift cannot be moved, needs to be repaired during the day.

Late Shift summary

Achievements:
- recovered the beam overlap
- changed lens position to have larger OL beam
- spatial overlap on YAG
- measured RIXS data delay scan at fixed photon energy

Problems:
- none

## Shift summary night July 28th-29th

Achievements:
- we saw signal on both MCPs (with a voltage of around 1500 V). We used the MCPs to measure XAS at Cu L edge at different theta angles from 120 deg (specular to MCPs) to 70 deg (facing hRIXS). At grazing angles the spectrum is a bit distorted, but just to see the edge is perfectly fine. If there is a diode on the way, the MCP sees  still some fluorescence.
- we saw the direct beam at APD 8 with transmission 0.02 % and 55 V bias voltage.
- we saw signal also on diode 4 and APD5
- the detectors connected are: diode 2, diode 4, APD 5, MCP_BIG and MCP_SMALL
- we looked for signal at rixs on CoO, but it was too weak so we asked BKR to go to vertical polarization
- beam with vertical polarization was transported to the sample
- continie the optimization of hRIXS at Su and hr grating

Problems:
- XAS processor was not working, tried to change date source, but it didn't help.
- diode 6 could not see any signal, probably because it is obstractad by thte antenna back

Program for next shift:
 - finish optimization at Cu edge hr grating

- optimize for Fe, at this geometry or rotated hRIXS.

A ZZ is taking place today, 31.01 at 11:30, in XTD9 to verify and fix the M3 Pop-in screen which is currently blocking the beam. It is not yet clear if this is an electrical or mechnical problem.  

** Update 13:05: ZZ intervention is finished and successful. A mechanical issue due to a loose coupling between motor and spindle was fixed. Machine is running again and SPB/SFX can use the beam.

BKR called PRC around 06:10AM to inform on vacuum issues at SA1 beamline leading to a lost beam permission for the North Branch.

VAC-OCD found an ion pump in the PBLM / XTD9 XGM presented a spike in pressure that triggered valves in the section to close.

After reopening valves the beam permission was restored; further investigations and monitoring in coming days will continue. Currently all systems work normally.

https://in.xfel.eu/elog/Vacuum-OCD/252

V0 valve for SA2 closed as the pump P22090I at HED branch enters in wrong state. This closed nearby vacuum valves for HED branch and consequently V0. Vacuum levels at the section remained in 10^-9 all time.

Thanks to VAC-OCD Denis Finze we removed this pump signal from interlock to allow operation in SA2 at MID branch. Further investigation will follow on Friday.

Dear MID colleagues, Svitozar (PRC), Bolko and Shan (RCs),
This morning we faced the situation where MID was limited to 400 pulses (mode M) via the EPS signals. The current RF window set at the machine allows to the requested 450 pulses.
The limiting conditions were the inserted graphite filter (#2) and the diamon screen at the MID Pop-in (#17). After a discussion with experts (and thanking Naresh, Wolfgang and Andreas), both conditions in EPS mode F (see attached) are now disabled, as the current SA2 beam offer safe condition for both devices.
This special situation with disabled EPS signals in mode F is in place until Tuesday 05.Nov as MID will stay at ~12.28keV and with HXRSS (500-600uJ). Please note that in case of either a change in photon energy, substantial increase of photon flux, longer SA RF window or the wish to insert YAG screen at the SA2 Pop-in, these two mentioned conditions have to be enabled again at the SA2 EPS Mode F prior these actions take place.
After the beamtime ends on Tuesday 7AM, either me, Naresh or the PRC will make sure these two EPS conditions are re-enabled.
In case of questions please do not hesitate in contacting me.
Best wishes,
Frederik

**Update Mon 15:00: The beamtime delivery to MID is extended up to Tuesday 9AM. At this moment the EPS signals will be enabled again by Frederik W.-F.

- While FEL IMG with YAG screen was inserted in SA1, EPS/MPS was not limited to the expected 2 bunches, but to 30 bunches; 
- It was found the condition #3 ("SA1_XTD2_VAC/Switch/SA1_PNACT_Close") at the EPS Mode-S was disabled which should be always enabled; 
- Condition #3 has been enabled again and now SA1 is limited to 2 bunches, as expected when YAG screen is inserted. 

Further investigations will be done to find why and when it was disabled. 

SA2 cell#5 undulator segment moved at ~09:45AM Fri to 25mm without aparent reason and undulator experts need a ZZ to exchange power supply; FEL instensity dropped from 230uJ to 60uJ s consequence.

RCs are preparing south branch for the iminent ZZ. HED is informed.

**Update: ZZ finished by 12:10; recovered performance and re-started delivery by 13:30.

Laser status:

After the laser issues listed in https://in.xfel.eu/elog/OPERATION-2024/99 the late shift was finally able to find a timing setting for the amplifier trigger that was beyond stable settings under usual conditions, but which allowed to continue taking data runs for the rest of the beamtime reliably. The users were already able to reveal indications of a pump-probe signal in their data.

The issue itself remains but didn't show up in form of unstabilities anymore. After the beamtime LAS took some effort to investigate and narrow down to either a faulty trigger going into the front-end amplifier or on the front-end amplifier itself. To the best of our knowledge this circumstance will need to involve EEE support or even a service from the manufacturer and cannot be solved solely by LAS. LAS ensured that the highest priority will be to deliver stable laser pulses for next week's beamtime as well.

FEL status:

we found the FEL poynting to be very stable troughout the last weeks beamtime (despite some short down-times), which allowed to reliably verify the spatial overlap.

31.01.2024 (Day shift)

X-ray delivery

• 10 keV
• 1200 - 400 uJ (significant pulse energy slope within train)

Optical laser delivery

• None

Achievements/Observations

• Flat fields and timing scans were measured for AGIPD (1.1MHz, normal CDS mode)

Issues

• Interlocks issue causing beam to be interrupted when the beamline shutter was open https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Issues/near/32289
• Opening EXP hutch gate valves resulted in vacuum issue https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Alignment/near/32195
• Pulse pattern decoder recorded empty arrays, even though data were visible in Karaboo https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Issues/near/32299
• AGIPD timing issue caused by the wrong Trigger Source https://mylog.connect.xfel.eu/#narrow/stream/111-SPB_900429_RichardBean/topic/Detector.20Status/near/32408

To do for next shift

• Continue with the detector program

X-ray delivery

• 6 keV, 2.6 mJ/pulse, stable delivery

Optical laser delivery

• 800nm PP laser, stable delivery

Achievements/Observations

• NKB focus optimized and PSLITS optimized
• Beam going through IBS camera
• PP laser rough timing checked w.r.t. X-ray
• Catcher and injector motors (X, Z) are aligned well with about 1.5mm offset in X

Issues

• Manifold-MDL issue (reported in Issues tap)
• SPB_IRU_LIQUIDJET/CAM/1 (IRU nozzle insertion camera) is not working. Power cycle required.
• SPB_EHU_Valve closed 2-3 times due to vacuum interlock
• Space (KF50 pipes) in the super-structure was too long for the user injector (nozzle rod). After taking off small spacer, nozzle is very close to the injector valve during insertion. Please check it out whether we can find any better solution or not.

X-ray delivery

6 keV, 2.4 mJ/pulse, stable delivery

Optical laser delivery

800nm PP laser, stable delivery

Achievements/Observations

NKB focus cslits optimized
Some progress with AGIPD background although we still need to improve
Catcher and injector motors (X, Z) are aligned well; with defroster, had under 5mm offset in X
Managed to get a jet and overlap with X-rays.

Issues

Beckhoff flowmeters were disconnected and we were not sure which ports to connect, maybe spent 45min to connect to the right ports and restart device.
Helium flow meter was on but not updating, had to restart it too.
Marco noted actual measured flow at beckhoff VS HPLC set flow was perhaps too low, not sure
Vacuum with injector improved, issue was related to nozzle preparation, however even after this fix the chamber pressure was just over the AGIPD interlock. After tuning gas/liquid flow managed to go under it, but possibly this can also be improved.
Often number of pulses was being changed without us requesting it.
One AGIPD module stopped working after moving quadrant.
DAQ data aggregator crashed a few times, Steffan Hauf will look into this issue after we finished the shift.
Could not move one of the AGIPD quadrant (Q4) due to interlock
Background in Q1 and Q3 needs to be optimized, and/or quadrants needs to be moved.

**X-ray delivery**

- 6 keV, 3.2 mJ/pulse, stable delivery

**Optical laser delivery**

- 800nm PP laser for jet illumination, stable delivery

**Achievements/Observations**

- NKB focus checked and IUT_Slits optimized
- AGIPD quadrants position finalized
- Measured a lot of water BG runs and few runs with Au nanoparticles (sphere with ~50 nm in diameter)

**Issues**

- SideMic data not saved properly (empty array).
- Found relatively high BG when nozzle is IN since the distance in between nozzle tip & the interaction region is ~100um (even 80 um in some cases).
- DA issue (DAQ was stuck in changing) although all the DA looked healthy. DOC fixed the issue (temporarly) together with Egor, Florian, and Steffen.
- Runs callibration were not working

X-ray delivery

• 12.72 keV, 10 Hz, NOT stable delivery, pointing drastically changed in the afternoon, presumably due to the train-on-demand operation at SASE2

Optical laser delivery

• 487 nm ns laser (not used)
• 800 nm PP laser for sample illumination

Achievements/Observations

• Beam is aligned for IRDa
• lysosyme date was collected for JF4M geometry

Issues

• X-ray pointing changed in the afternoon, we have to figure out why and whether we can avoid losing trajectory
• Beam is currently clipped and EHC_SCR, @Romain Letrun , @Adam Round please take a look tomorrow
• Detector background was not optimal, might require more work tomorrow
• Roadrunner RX motor did not move, in Karabo, was giving error messages @Adam Round please take a look, maybe resetting the roadrunner outside of Karabo can help
• AGIPD MFPGA2 issue (keep acquiring) which was solved by power cycle

Pulse energy fluctuation observed after full train operation in SA2 starts.